Dobinsons IMS Struts and Shocks - Adjustable Height Monotubes - FJ Cruiser

crikeymike

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The cat got out of the bag recently about the new Dobinsons IMS shocks, so I'm starting this thread to give the details about these new struts and shocks from Dobinsons that are arriving in March 2020, and some versions coming after (long travel, no ETA yet, but probably some time in June 2020).

IMS
I
nternal reservoir
Monotube
Shocks

I guess IRMS sounded silly, and considering the already existing MRR (Monotube Remote Resi), a non-resi version didn't sound right either, this is the wording Dobinsons are going with.

In a nutshell, the IMS struts and shocks are almost the same as the MRR/MRA but with an IFP (Internal Floating Piston) inside the shock body with a small gas reservoir, and no external hose or reservoir. Same monotube body size, piston diameter, shaft thickness, and also the struts are height adjustable thanks to the fully threaded body. Super easy installation.
These do not have any valving adjustment.

From the manufacturer:
Dobinsons IMS Monotube Shock Absorbers are designed for next level performance over Twin Tube Shocks in those hot, harsh, demanding conditions. By utilising the Monotube design, Dobinsons IMS Shock Absorbers are able to resist fade far longer on corrugated roads, long or hard working 4WD trips, towing or racing conditions.

The larger 50 and 60mm high flow pistons reduce internal pressures, reduce the heat generated, transfer heat to the body for faster cooling and offer improved damping performance and vehicle control at higher shaft speeds on rough terrain and during big impacts. Threaded bodies on struts allow for fine tuning of height and offer further improvements in cooling.
The micro-polished, hard chromed and heat treated shock shaft, CNC aluminium high flow race inspired piston, and DOM seamless tubing body provides the ultimate in performance and off-road durability.

Composite piston wear bands and a race style 3-stage sealing system offer the lowest levels of friction whilst maintaining durability and longevity. Dobinsons team of engineers spend hundreds of hours of testing and tuning
the shim stacks and damping characteristics in each IMS Shock to ensure a balance of comfort, handling, vehicle control and offroad performance - Enjoy the ride


Features
  • Fully re-buildable and re-valvable
  • Zero shock fade in all terrains with full load
  • Direct, bolt-on replacement for easy fitment
  • Uses existing full range of coil springs and top mounts
  • Highest quality rubber bushings top and bottom for maximum NVH dampening
  • Corrosion resistant (EDP Surface Protection)
  • Heavy duty single piece lower leg
  • Enormous oil capacity
  • Heavy Duty 3 Stage FKM HNBR Sealing System for the ultimate in reliability
  • Race inspired hi-flow CNC 6061 Billet alloy piston – for the ultimate in offroad handling
  • 56mm/2.2” Bodied Series - 50mm hi-flow CNC 6061 Billet alloy piston - 50mm bore
  • 66mm/2.6” Bodied Series - 60mm hi-flow CNC 6061 Billet alloy piston - 60mm bore

The body size is 56mm with a 50mm piston for these vehicles:
4th/5th Gen 4Runner
2nd/3rd Gen Tacoma
Lexus GX470 and GX460

The body size is 66mm with a 60mm piston for these vehicles:
Land Cruiser 80, 100, and 200 series

Part numbers for FJ Cruser IMS struts and shocks. Click on part number to see pricing and further details of each item. **SOLD IN PAIRS**
Struts - Early models until 2009
IMS59-50220 - IMS Front Struts - suits 0-3.5" lift - stock arrived 3/19/20

Struts - Late models 2010+
IMS59-50700 - IMS Front Struts - suits 0-3" lift - stock arrived 2/25/20
IMS59-50574 - IMS Front Long Travel Struts - suits 2-3.5" lift - stock arrived 3/19/20

All model rears
IMS59-50705 - IMS Rear Shocks comfort valved - suits 0-3" lift - stock arrived 3/19/20
IMS59-50701 - IMS Rear Shocks medium/heavy valved - suits 0-3" lift - stock arrived 2/25/20 (use these for a vehicle with constant rear weight)
IMS59-50575 - IMS Rear Long Travel Shocks - suits 3"+ lift (not for KDSS models) due May/June 2020


Initial pricing is $500/pr front struts and $450/pr rear shocks.


Dobinsons-IMS-description.PNG


Dobinsons-IMS-spec-sheet.PNG


Dobinsons IMS 4runner kit.jpg
 
Last edited:
Joined
Mar 13, 2017
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australia
These have been around a while i believe, they are just a ifp version of the resovoir shocks and no different in design to a fox, radflo, bilstein etc
 

crikeymike

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These have been around a while i believe, they are just a ifp version of the resovoir shocks
Yep, as I stated above: In a nutshell, the IMS struts and shocks are almost the same as the MRR/MRA but with an IFP (Internal Floating Piston) inside the shock body with a small gas reservoir, and no external hose or reservoir. Same monotube body size, piston diameter, shaft thickness, and also the struts are height adjustable thanks to the fully threaded body.

These are the latest version however with all of the design features listed above, and these were never offered in the USA before.
 
Joined
Mar 13, 2017
Messages
411
Location
australia
Yep, as I stated above: In a nutshell, the IMS struts and shocks are almost the same as the MRR/MRA but with an IFP (Internal Floating Piston) inside the shock body with a small gas reservoir, and no external hose or reservoir. Same monotube body size, piston diameter, shaft thickness, and also the struts are height adjustable thanks to the fully threaded body.

These are the latest version however with all of the design features listed above, and these were never offered in the USA before.
Ahye here in aus we have had these for a while, just called the mt Monotube Dobinsons Non Remote Reservoir shocks hit the market.
 

crikeymike

Exit Offroad - Dobinsons Specialist
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Just updating ETA's here.

IMS59-50700 and IMS59-50701 have arrived and will start shipping out any day now.
 

crikeymike

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Stock update: The March container arrived today, so all of these are now in stock.

Struts - Early models until 2009
IMS59-50220 - IMS Front Struts - suits 0-3.5" lift - stock arrived 3/19/20

Struts - Late models 2010+
IMS59-50700 - IMS Front Struts - suits 0-3" lift - stock arrived 2/25/20
IMS59-50574 - IMS Front Long Travel Struts - suits 2-3.5" lift - stock arrived 3/19/20

All model rears
IMS59-50705 - IMS Rear Shocks comfort valved - suits 0-3" lift - stock arrived 3/19/20
IMS59-50701 - IMS Rear Shocks medium/heavy valved - suits 0-3" lift - stock arrived 2/25/20 (use these for a vehicle with constant rear weight)
 
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